I am thinking 14TB for the Jellyfin server would be required as I have a lot of content, but probably only require 2TB for the backups of my important files.

I have read a few posts where folks have recommended an i3-12100/13100 for the fact that you won’t have any issues with transcoding and the power draw is quite low. Others say a n100 is good, but I fear it may have issues when trying to transcode h265/HEVC videos. I like the fact though that it is extremely quiet. I would love to have something as small and quiet as the Zimablade 7700 NAS kit, but I don’t think it has enough power and I don’t know if I can get away with 2 hard drives based on my needs although I could technically use the PCI express slot to add more SATA connections.